Topic: 630 to 530 chain conversion

[hazardus320]

I am looking to use a 530 chain on my '78.  I know the '77 and '78 came stock with the 630, and the '76 came stock with the 530 (and their corresponding sprockets as well).

Does anyone know if I could just order up some of the '76 stock sprockets and bolt them up? Or if there is any issues with doing so?  Thanks in advance!

Sent from my SM-N900T using Tapatalk

[raymond10078]

http://forums.sohc4.net/index.php?topic=82498.0

[hazardus320]

Thank you sir, sorry my searching skills were subpar!

Sent from my SM-N900T using Tapatalk

[chickenman_26]

Just to update that thread - that was almost three years ago. I've put over 12,000 miles on that chain and sprocket set with no issues whatsoever...other than the lousy fit of the front sprocket on the shaft. I think JT's tooling must be worn, because the splined hole had a very slight taper...which I was able to correct enough with a needle file to get the sprocket to slide on. Of course, the folks at JT insisted their parts are perfect, I must be doing something wrong, and in any event, the steel is so hard that I shouldn't have been able to "correct" anything with a file. 

Just FYI, Parts Unlimited sells a sprocket which is a direct replacement for the original '76 750A Honda part #. Their part number is K22-2519. One on eBay right now.
http://www.ebay.com/itm/FRONT-SPROCKET-HONDA-530-Chain-17T-K222519-23801-300-010-L4-/370679919415

Part # = 23801-300-010
Part Description = SPROCKET (17T) - (replaces 23801-300-000)
Model Count = 16
CB500 1971 500 500 Four Street
CB500-K1 1972 500 500 Four Street
CB500-K2 1973 500 500 Four Street
CB550F-K2 1975 550 550 Super Sport Street
CB550F-K3 1976 550 550 Super Sport Street
CB550F-K4 1977 550 550 Super Sport Street
CB550-K0 1974 550 550 Four Street
CB550-K1 1975 550 550 Four Street
CB550-K2 1976 550 550 Four Street
CB550-K3 1977 550 550 Four Street
CB550-K4 1978 550 550 Four Street
CB750A-76 1976 750 CB750A Hondamatic Street
CB750F-K5 1975 750 750 Super Sport Street
CB750F-K6 1976 750 750 Super Sport Street
CB750K 1969 750 750 Four Street
CB750-K0 1970 750 750 Four Street




Stu

[Jerry Rxman Griffin aka MuthaF'er]

Hope this helps. Copy of email.

Yes,

 

Part number 517-17

Cost $24.99

 

Give me a call if you would like to order.

 

Thank you,

 

DeeDee Sarao

Office Manager

Sprocket Specialists

(530) 533-0802

(530) 533-0663 Fax

deedee@sprocketspecialists.com

-----Original Message-----
From: Jerry Griffin [mailto:geraldjgriffin@gmail.com]
Sent: Sunday, September 29, 2013 10:25 PM
To: info@sprocketspecialists.com
Subject: General Question

 

Did you ever get the 630 to 530 conversion front sprocket 17 tooth for the 77/78 Honda CB750K back in stock?

[limerence]

I have a 78 CB750A. I just bought the Parts Unlimited sprocket that chickenman suggested.

Any guidance on what size 530 chain is needed?

Thanks,
John

[dave the welder]

I used the sun star conversion kit for my 77 750A 2 years ago.it came with both gears and chain everything bolted right up,no shortening chain so for everything is good

[limerence]

Hmmm... would you happen to have a link to the kit? I cant find it on sun stars site.

I also bought the parts unlimited front sprocket already so will have to piece together the kit. Looking at the kit would help me to know what else I need to buy.

Thanks,
John

[dave the welder]

ebay Honda750A parts

[chickenman_26]

I have a 78 CB750A. I just bought the Parts Unlimited sprocket that chickenman suggested.

Any guidance on what size 530 chain is needed?

Thanks,
John

John,
Check your private messages

Stu

[limerence]

Thanks Stu.

Parts are ordered!

[hazardus320]

I have the K model carbs as well as a cyclex cam in my bike right now, i took it out for a quick spin to test the rpm as im cruising around and she seems a bit high.  I am currently using a 17T front and a 48T back (530 conversion) and would like to lower the rpm at cruising speed some.  My options from Sunstar, that i see are (for the back):  38T, 40T, 43T, 45T . 

Do you guys have any recommendations for what size i should lower to to achieve my goal of a lower RPM at ~60mph?  The more detail as to why, the better!  Thanks in advance!

[calj737]

Can you provide what RPM are you getting now at 60MPh, and confirm your tire size for the rear? Also, what do you believe is the target RPM you seek for the speed?

[hazardus320]

I would provide an RPM if I had a tach, but unfortunately I do not.  I am using the standard tire size for the '78 750a.  Unsure of RPM I am seeking to be exact.  All I know is it currently is wound more up than I would like at that speed.

[hazardus320]

I just bought a 43T for the rear.  Once spring hits I will let you guys know how she goes with it installed.  Damn MN winters!  At least I have a heated garage to tinker in!

Sent from my SM-N910T using Tapatalk

[nixon]

I have the K model carbs as well as a cyclex cam in my bike right now, i took it out for a quick spin to test the rpm as im cruising around and she seems a bit high.  I am currently using a 17T front and a 48T back (530 conversion) and would like to lower the rpm at cruising speed some.  My options from Sunstar, that i see are (for the back):  38T, 40T, 43T, 45T . 

Do you guys have any recommendations for what size i should lower to to achieve my goal of a lower RPM at ~60mph?  The more detail as to why, the better!  Thanks in advance!

definitely liking the 17-43. up to 80km/hr in 1st..
530 conversion from sunstar fit no issues whatsovver. Its rivet not clip link though so get the tool before your order ! nothing worse than a rebuilt rear end with just a link stopping a test ride..trust me